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The piezoresistivity effect of conductive asphalt concrete (CAC) and
mechanism of the effect are analyzed in this paper. Experimental results
show that the applied stress or strain could have a great influence on the
resistance of conductive asphalt concrete, and this influence is called the
piezoresistivity effect. The piezoresistivity effect reflects the
microstructure change of asphalt concrete. The piezoresistivity mechanism
of CAC is studied through the research on the conductive substance and
conductive mechanism of carbon fiber and graphite modified asphalt
concrete. A series-wound model is built to interpret the piezoresistivity
effect. This model explains why CAC has a piezoresistivity effect. The
number of electronic carriers in the interior structure influences the
electrical property of CAC and this number would change in different
loading conditions. Therefore, the piezoresistivity effect of CAC can be
analyzed by electronic carriers' number and the relationship between
resistivity and number of electronic carriers is the inverse ratio.
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